Detail 01
20 muff-circuit adjustment points
The circuit offers adjustment at 20 separate points.

Independent shopping perspective
De La Riva BM20-ULTRA is an all-analog distortion pedal built around extensive muff-circuit adjustment. Twenty circuit adjustment points, germanium or silicon transistor selection, and a fully bypassable tone section give you a large number of ways to configure it. The result is a pedal intended for hands-on sound shaping rather than a fixed control layout. With more than four million possible settings, it rewards deliberate experimentation when you want to explore its available circuit options.

Strong match
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
The circuit offers adjustment at 20 separate points.
Detail 02
You can switch between those two transistor types.
Detail 03
The tone section can be taken completely out of the circuit.
Detail 04
These are the pedal's width, height, and depth dimensions.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Yes. It is described as 100% analog.
Yes. The tone section can be completely bypassed.
It can be switched between germanium and silicon transistors.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.